Operation Barbarossa - Season 1 Episode 1 Now you see him, now you don't

A black, mysterious boy appeared in Koko's class. He doesn't hang out with his colleagues, he doesn't play football, he knows a lot, and he doesn't answer any questions at school. Something is wrong with him. Koko, who has a nose for real secrets, begins to doubt him. And yet, he still has no idea what he's gotten himself into...